Measurement of muon flux behind the beam dump of the J-PARC Hadron Experimental Facility

IF 1.5 3区物理与天体物理 Q3 INSTRUMENTS & INSTRUMENTATION

Nuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment Pub Date : 2024-10-20 DOI:10.1016/j.nima.2024.169990

T. Matsumura , Y. Hirayama , G.Y. Lim , H. Nanjo , T. Nomura , K. Shiomi , H. Watanabe

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Abstract

A muon-flux measurement behind the beam dump of the J-PARC Hadron Experimental Facility was performed with a compact muon detector that can be inserted into a vertical observing hole with 81 mm in diameter which was dug underground. The detector consists of 12 plastic scintillation strips with a length of 80 mm each, which are arranged with cylindrical shape and contained inside an aluminum housing with an outer diameter of 75 mm. A silicon photomultiplier is coupled to the end of each strip to collect the scintillating light. The flux of the muons penetrating the beam dump was scanned vertically at intervals of 0.5 m, showing a wide distribution with a maximum at the beam level. The muon flux was consistent with the expectation from a Monte-Carlo simulation at more than 1 m away from the beam axis, which is expected to be used for signal-loss evaluation in the future KOTO II experiment for measuring rare kaon decays. The data can also be used in improving the accuracy of shielding calculations in the radiation protection.

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测量 J-PARC 强子实验设施束流倾卸场后面的μ介子通量

在J-PARC强子实验设施的束流堆后面，使用一个紧凑型μ介子探测器进行了μ介子流量测量，该探测器可以插入地下开凿的直径为81毫米的垂直观测孔中。探测器由 12 个塑料闪烁条组成，每个闪烁条长 80 毫米，呈圆柱形排列，装在一个外径 75 毫米的铝制外壳内。每个闪烁条的末端都有一个硅光电倍增管，用于收集闪烁光。以 0.5 米的间隔垂直扫描穿透光束倾倒区的μ介子通量，结果显示其分布范围很广，最大值位于光束水平。μ介子通量与蒙特卡洛模拟的预期一致，距离光束轴线超过1米，预计将用于未来KOTO II实验的信号损失评估，测量罕见的κ子衰变。这些数据还可用于提高辐射防护中屏蔽计算的准确性。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Nuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment 物理-光谱学

CiteScore

3.20

自引率

21.40%

发文量

787

审稿时长

1 months

期刊介绍： Section A of Nuclear Instruments and Methods in Physics Research publishes papers on design, manufacturing and performance of scientific instruments with an emphasis on large scale facilities. This includes the development of particle accelerators, ion sources, beam transport systems and target arrangements as well as the use of secondary phenomena such as synchrotron radiation and free electron lasers. It also includes all types of instrumentation for the detection and spectrometry of radiations from high energy processes and nuclear decays, as well as instrumentation for experiments at nuclear reactors. Specialized electronics for nuclear and other types of spectrometry as well as computerization of measurements and control systems in this area also find their place in the A section. Theoretical as well as experimental papers are accepted.